Quote:
Originally Posted by MattT
To continue this old post…..
I have one eyepiece I like to use with the 2" GSO Barlow…the ES 28mm 68º.
With the barlow as is …hmm not bad but a bit rough round the edges, which is not so good and had..past tense…me not using it much at all…until now.
As Kevin says..'mucking around with various extension tubes'…so I tried it, with a great result.
Using a f5 4" refractor (tough test for eyepieces) and my beloved 28mm 68 I tried the barlow lens screwed to the eyepiece…too much FC to bother. Then added a 35mm extension tube to the regular barlow (with 50mm tube) that is 85mm all up and got pinpoint stars to the edge…wow...totally unexpected. Might just be this eyepiece that has this result, but have a new found love for the 2" GSO 2X ED Barlow.
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What's even better is the 2" ES 2x Focal Extender, or Meade 2x 2" TeleXtender. I tried the Meade with a 2" 28mm ES 68 and it cleaned the edges right up in my 10" F/4.7 reflector.
I was amazed at how perfect the edges were when using the 28mm with the 2" 2x Focal Extender. The FE is a bit heavy, but it is worth the performance difference!
Cheers!